Method for finishing paper and paper products

Abstract

Process for finishing paper and paper products by treating the surface of paper or paper products with at least one finishing agent, at least one finishing agent being applied in the form of a pattern on the top and/or bottom of paper or paper products, and the papers and paper products obtainable by the process.

1 . A process for finishing paper or a paper product comprising treating the surface of said paper or paper product with at least one finishing agent, wherein the at least one finishing agent is applied in the form of a pattern to the top and/or bottom of said paper or paper product. 
   
   
       2 . The process according to  claim 1 , wherein the finishing agent is applied with the aid of a printing process to the top and/or bottom of said paper or paper product. 
   
   
       3 . The process according to  claim 1 , wherein the finishing agent is printed on the top and/or the bottom of said paper or paper product by a screen printing, inkjet printing, flexographic printing or offset printing process. 
   
   
       4 . The process according to  claim 1 , wherein the finishing agent is printed on the top of said paper or paper product by the inkjet printing process. 
   
   
       5 . The process according to  claim 1 , wherein an engine-sized paper or paper product is used. 
   
   
       6 . The process according to  claim 1 , wherein the finishing agents are applied in the form of a grid or of a rhombus or in spiral, circular, two-dimensional, strip or dot form on the top and/or bottom of paper or paper products, the pattern printed on being present in each case in ordered or in random form. 
   
   
       7 . The process according to  claim 1 , wherein the finishing agent is a strength agent, a water repellant, a hydrophilizing agent, a paper coating slip and/or a biocide. 
   
   
       8 . The process according to  claim 1 , wherein the finishing agent is at least one agent which increases the stiffness of paper. 
   
   
       9 . The process according to  claim 1 , wherein the finishing agent is a dry strength agent and/or a wet strength agent for paper. 
   
   
       10 . The process according to  claim 1 , wherein the finishing agent is at least one water repellant selected from the group consisting of alkyldiketenes, alkylsuccinic anhydrides, rosin size, polymer sizes based on styrene/(meth)acrylate polymers, isocyanates, ethylene copolymer waxes, polymers comprising siloxane groups and polymers comprising bound fluorine. 
   
   
       11 . The process according to  claim 1 , wherein the finishing agent is at least one heat-curable binder selected from the group consisting of the urea-formaldehyde adducts, urea-glyoxal adducts, melamine-formaldehyde adducts, phenol-formaldehyde adducts, one- and two-component systems based on epoxy resins, polyurethanes or isocyanates, polyacrylates, polymethacrylates, styrene/(meth)acrylate copolymer dispersions and styrene/butadiene/(meth)acrylic acid copolymer dispersions. 
   
   
       12 . The process according to  claim 1 , wherein the finishing agent is at least one heat-curable binder comprising
 (a) a polymer which is obtained by free radical polymerization and which comprises from 5 to 100% by weight of an ethylenically unsaturated carboxylic anhydride or of an ethylenically unsaturated dicarboxylic acid whose carboxyl groups can form anhydride groups, incorporated in the form of polymerized units, and   (b) at least one alkanolamine which comprises at least two hydroxyl groups in the molecule and/or at least one polyhydric alcohol.   
   
   
       13 . The process according to  claim 1 , wherein the finishing agent is at least one heat-curable binder comprising an aqueous mixture with at least one polycarboxylic acid and at least one polyhydric alcohol and/or at least one polyfunctional amine and/or an alkanolamine. 
   
   
       14 . The process according to  claim 1 , wherein the finishing agent is at least one biocide selected from the group consisting of polymers comprising vinylamine units, polymers comprising ethylenimine units, combinations of at least one polymer comprising vinylamine units and at least one organic quaternary ammonium salt and combinations of at least one polymer comprising ethylenimine units and at least one organic quaternary ammonium salt. 
   
   
       15 . A paper or paper product obtained by the process of  claim 1 .